<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>test html</title>
</head>
<body>
    <script type="text/javascript">
        var socket;
        if(window.WebSocket){
            socket = new WebSocket("ws://localhost:8899/ws");
            socket.onmessage = function (event) {
                var ta = document.getElementById("responseText");
                ta.value = ta.value + "\n" + event.data;
            }

            socket.onopen = function (event) {
                var ta = document.getElementById("responseText");
                ta.value = "连接开启";
            }

            socket.onclose = function (event) {
                var ta = document.getElementById("responseText");
                ta.value = "连接关闭";
            }

        }else{
            alert("浏览器不支持websocket");
        }
        
        function send(message) {
            if(!window.WebSocket){
                return ;
            }

            if(socket.readyState == WebSocket.OPEN){
                socket.send(message);
            }else{
                alert("连接尚未开启");
            }
        }
    </script>
    <form onsubmit="return false;">
        <textarea name="message" style="width:400px;height:200px"></textarea>
        <input type="button" value="发送数据" onclick="send(this.form.message.value)">
        <h3>服务端输出：</h3>
        <textarea id="responseText" style="width:400px;height:200px"></textarea>
        <input type="button" onclick="javascript: document.getElementById('responseText').value=''"
            value="清空内容">
    </form>
</body>
</html>